This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A226810 #3 Jun 19 2013 02:25:14
%S A226810 2,5,6,9,17,21,26,29,41,65,69,89,126,129,141,189,257,261,281,381,626,
%T A226810 629,641,689,881,1025,1029,1049,1149,1649,3126,3129,3141,3189,3381,
%U A226810 4097,4101,4121,4149,4221,4721,7221,15626,15629,15641,15689,15881,16385,16389
%N A226810 Numbers of the form 4^j + 5^k, for j and k >= 0.
%H A226810 T. D. Noe, <a href="/A226810/b226810.txt">Table of n, a(n) for n = 1..10000</a>
%t A226810 a = 4; b = 5; mx = 20000; Union[Flatten[Table[a^n + b^m, {m, 0, Log[b, mx]}, {n, 0, Log[a, mx - b^m]}]]]
%Y A226810 Cf. A004050 (2^j + 3^k), A226806-A226832 (cases to 8^j + 9^k).
%K A226810 nonn
%O A226810 1,1
%A A226810 _T. D. Noe_, Jun 19 2013